validate

validate is a skill for Claude Code, Codex from danweinerdev/claude-sdd-planner. It costs 46 tokens per session (1,501 once invoked), scanned A, a copy of sdd-validate, MIT.

A read-only checker for structured software-development documents and plans. It verifies their layout, statuses, completion evidence, dependencies, identifiers, and decision records.

In plain words
What is it for?
Use it to audit plans and related documents before coding, marking work complete, handing work to someone else, or running checks in continuous integration.
Why use it?
It reveals incomplete or inconsistent planning records without changing them, so problems can be fixed before implementation or handoff.

Skill for Claude CodeCodex

Part of the sdd-planner plugin — 34 skills, 7 agents shipped together

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/danweinerdev/claude-sdd-planner/validate
Any agent
npx skills add danweinerdev/claude-sdd-planner --skill validate
Clone the repo
git clone --depth 1 https://github.com/danweinerdev/claude-sdd-planner

Made for: Claude Code, Codex.

Or install sdd-planner, the plugin that ships this one along with the rest of its 34 skills, 7 agents.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for validate

README.md
[![agentmods](https://agentmods.dev/badge/skills/danweinerdev/claude-sdd-planner/validate.svg)](https://agentmods.dev/skills/danweinerdev/claude-sdd-planner/validate)
Your own site
<a href="https://agentmods.dev/skills/danweinerdev/claude-sdd-planner/validate"><img src="https://agentmods.dev/badge/skills/danweinerdev/claude-sdd-planner/validate.svg" alt="Measured on agentmods" height="20"></a>
Per session 46 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,501 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 86% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00046 $0.01501
Opus 5 $0.00023 $0.00750
Sonnet 5 $0.00009 $0.00300
Haiku 4.5 $0.00005 $0.00150

Measured 3d ago against content hash 86a2223f7eb7, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

validate scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

86% identical to sdd-validate — 15 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

commands/validate/SKILL.md · 62 lines

How it starts

The opening of the file, as written. The whole thing — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/validate — Validate SDD Artifacts

Path Resolution

The plugin directory contains commands/, agents/, scripts/, and shared/ as siblings. Find it by globbing for **/commands/research/SKILL.md in both the current directory and ~/.claude/plugins/cache/; if multiple versions match, sort them as semantic versions (like sort -V) and use the highest, then strip commands/research/SKILL.md from the match. Resolve the planning root per shared/path-resolution.md in the plugin directory. Also read shared/frontmatter-schema.md, shared/completion-evidence.md, shared/decision-log.md, and shared/review-artifacts.md — the conventions the validator enforces.

When to Use

Before implementation, before any completion transition, before handoff, or in CI. Read-only: validation never edits, moves, creates, or deletes artifacts and never changes a status — it reports exact findings for a lifecycle skill or user-authorized repair to address.

Process

1. Run the deterministic validator

From the target repository root:

sdd validate --format json

Pass --scope <planning-root-relative-path-or-artifact-name> when the user named a narrower scope. Scoped validation includes every discoverable artifact selected by that path/name and follows transitive explicit related links — a plan scope covers all plan-owned artifacts plus its governing related graph even when the scope names its README or one phase. Bare names that match multiple artifact roots are rejected as ambiguous; use the reported planning-root-relative path. JSON output lists the exact successfully parsed artifacts_in_scope; diagnostics for malformed files under the requested scope remain visible. Unresolved references remain diagnostics on the artifact that cites them; an existing but undiscoverable file is never claimed as validated.

If sdd is unavailable, report the error and stop rather than silently replacing deterministic checks with model judgment. Exit 0 means scripted checks passed, exit 1 means the JSON diagnostics are authoritative findings, and exit 2 means validation could not run. Never execute artifact-recorded evidence commands as part of validation.

Read the full file on GitHub · 62 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 62 lines · 46 tokens per session scan A 86a2223f7eb7

Subscribe to this mod's changes

validate is a skill published in the GitHub repository danweinerdev/claude-sdd-planner (2 stars, last pushed 5d ago), licensed MIT. It adds 46 tokens to every session and 1,501 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 86% identical to sdd-validate, differing in 15 lines, and is treated as a copy.

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